90 mm four-element apochromatic telescope, 609 mm focal length, with a naturally flat field of view for astrophotography.<\/p>\n
The corrector is part of the optical design: an additional flattener is not required in the native configuration provided by ZWO. The 44-mm image circle is specifically designed for full-frame sensors. The choice of camera depends on the focal length, pixel size, and intended targets. The retractable dew shield facilitates transport; the detachable clamps allow for mounting on a compatible dovetail. The eyepiece holder features a geared focus mechanism and rear rotation to adjust the framing. Adjust the focus using the actual photography setup, including filters. Ensure compliance with the mount\u2019s mechanical range and check cable routing throughout the mount\u2019s full range of motion. This product corresponds to the FF90 APO optical tube; kits with a mount are sold separately.<\/p>\n
| Brand<\/th>\n | ZWO<\/td>\n<\/tr>\n |
|---|---|
| Opening<\/th>\n | 90 mm<\/td>\n<\/tr>\n |
| Focal length<\/th>\n | 609 mm<\/td>\n<\/tr>\n |
| Focus report<\/th>\n | f\/6,8<\/td>\n<\/tr>\n |
| Optical package<\/th>\n | Four spaced elements, including one ED glass element<\/td>\n<\/tr>\n |
| Image circle<\/th>\n | 44 mm<\/td>\n<\/tr>\n |
| Focusing<\/th>\n | Rack, 1:10 gear ratio<\/td>\n<\/tr>\n |
| Backward rotation<\/th>\n | 360\u00b0<\/td>\n<\/tr>\n |
| Interfaces<\/th>\n | M48 \u00d7 0.75 and M54 \u00d7 0.75<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n |